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Optimised and improved compatability for inverted split lines hardware configuration.

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This commit is contained in:
Stephen White 2018-06-03 17:43:36 +10:00
parent 746c9efb1d
commit f1623f64c6
4 changed files with 73 additions and 25 deletions
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66
src/iec_bus.cpp
View file

@ -18,6 +18,8 @@
#include "iec_bus.h"
static int buttonCount = sizeof(ButtonPinFlags) / sizeof(unsigned);
u32 IEC_Bus::PIGPIO_MASK_IN_ATN = 1 << PIGPIO_ATN;
u32 IEC_Bus::PIGPIO_MASK_IN_DATA = 1 << PIGPIO_DATA;
u32 IEC_Bus::PIGPIO_MASK_IN_CLOCK = 1 << PIGPIO_CLOCK;
@ -58,26 +60,74 @@ u32 IEC_Bus::inputRepeatPrev[5];
m6522* IEC_Bus::VIA = 0;
void IEC_Bus::Read(void)
u32 IEC_Bus::emulationModeCheckButtonIndex = 0;
void IEC_Bus::ReadBrowseMode(void)
{
IOPort* portB = 0;
unsigned gplev0 = read32(ARM_GPIO_GPLEV0);
int index;
int buttonCount = sizeof(ButtonPinFlags) / sizeof(unsigned);
for (index = 0; index < buttonCount; ++index)
{
UpdateButton(index, gplev0);
}
if (VIA) portB = VIA->GetPortB();
bool ATNIn = (gplev0 & PIGPIO_MASK_IN_ATN) == (invertIECInputs ? PIGPIO_MASK_IN_ATN : 0);
if (PI_Atn != ATNIn)
{
PI_Atn = ATNIn;
}
if (portB && (portB->GetDirection() & 0x10) == 0)
AtnaDataSetToOut = false; // If the ATNA PB4 gets set to an input then we can't be pulling data low. (Maniac Mansion does this)
if (!AtnaDataSetToOut && !DataSetToOut) // only sense if we have not brought the line low (because we can't as we have the pin set to output but we can simulate in software)
{
bool DATAIn = (gplev0 & PIGPIO_MASK_IN_DATA) == (invertIECInputs ? PIGPIO_MASK_IN_DATA : 0);
if (PI_Data != DATAIn)
{
PI_Data = DATAIn;
}
}
else
{
PI_Data = true;
}
if (!ClockSetToOut) // only sense if we have not brought the line low (because we can't as we have the pin set to output but we can simulate in software)
{
bool CLOCKIn = (gplev0 & PIGPIO_MASK_IN_CLOCK) == (invertIECInputs ? PIGPIO_MASK_IN_CLOCK : 0);
if (PI_Clock != CLOCKIn)
{
PI_Clock = CLOCKIn;
}
}
else
{
PI_Clock = true;
}
Resetting = !ignoreReset && ((gplev0 & PIGPIO_MASK_IN_RESET) == (invertIECInputs ? PIGPIO_MASK_IN_RESET : 0));
}
void IEC_Bus::ReadEmulationMode(void)
{
IOPort* portB = 0;
unsigned gplev0 = read32(ARM_GPIO_GPLEV0);
UpdateButton(emulationModeCheckButtonIndex, gplev0);
emulationModeCheckButtonIndex++;
emulationModeCheckButtonIndex %= buttonCount;
portB = VIA->GetPortB();
bool ATNIn = (gplev0 & PIGPIO_MASK_IN_ATN) == (invertIECInputs ? PIGPIO_MASK_IN_ATN : 0);
if (PI_Atn != ATNIn)
{
PI_Atn = ATNIn;
if (VIA)
//if (VIA)
{
if ((portB->GetDirection() & 0x10) != 0)
{
@ -100,13 +150,13 @@ void IEC_Bus::Read(void)
if (PI_Data != DATAIn)
{
PI_Data = DATAIn;
if (VIA) portB->SetInput(VIAPORTPINS_DATAIN, DATAIn); // VIA DATAin pb0 output from inverted DIN 5 DATA
portB->SetInput(VIAPORTPINS_DATAIN, DATAIn); // VIA DATAin pb0 output from inverted DIN 5 DATA
}
}
else
{
PI_Data = true;
if (VIA) portB->SetInput(VIAPORTPINS_DATAIN, true); // simulate the read in software
portB->SetInput(VIAPORTPINS_DATAIN, true); // simulate the read in software
}
if (!ClockSetToOut) // only sense if we have not brought the line low (because we can't as we have the pin set to output but we can simulate in software)
@ -115,13 +165,13 @@ void IEC_Bus::Read(void)
if (PI_Clock != CLOCKIn)
{
PI_Clock = CLOCKIn;
if (VIA) portB->SetInput(VIAPORTPINS_CLOCKIN, CLOCKIn); // VIA CLKin pb2 output from inverted DIN 4 CLK
portB->SetInput(VIAPORTPINS_CLOCKIN, CLOCKIn); // VIA CLKin pb2 output from inverted DIN 4 CLK
}
}
else
{
PI_Clock = true;
if (VIA) portB->SetInput(VIAPORTPINS_CLOCKIN, true); // simulate the read in software
portB->SetInput(VIAPORTPINS_CLOCKIN, true); // simulate the read in software
}
Resetting = !ignoreReset && ((gplev0 & PIGPIO_MASK_IN_RESET) == (invertIECInputs ? PIGPIO_MASK_IN_RESET : 0));

7
src/iec_bus.h
View file

@ -328,7 +328,8 @@ public:
}
}
static void Read(void);
static void ReadBrowseMode(void);
static void ReadEmulationMode(void);
static void WaitUntilReset(void)
{
@ -507,7 +508,7 @@ public:
{
while (IsAtnAsserted())
{
Read();
ReadBrowseMode();
}
}
///////////////////////////////////////////////////////////////////////////////////////////////
@ -600,6 +601,8 @@ private:
static u32 PIGPIO_MASK_IN_SRQ;
static u32 PIGPIO_MASK_IN_RESET;
static u32 emulationModeCheckButtonIndex;
static bool PI_Atn;
static bool PI_Data;
static bool PI_Clock;

12
src/iec_commands.cpp
View file

@ -50,7 +50,7 @@ extern unsigned versionMinor;
#define WaitWhile(checkStatus) \
do\
{\
IEC_Bus::Read();\
IEC_Bus::ReadBrowseMode();\
if (CheckATN()) return true;\
} while (checkStatus)
@ -367,7 +367,7 @@ bool IEC_Commands::ReadIECSerialPort(u8& byte)
timer.Start(200);
do
{
IEC_Bus::Read();
IEC_Bus::ReadBrowseMode();
if (CheckATN()) return true;
}
while (IEC_Bus::IsClockReleased() && !timer.Tick());
@ -396,7 +396,7 @@ void IEC_Commands::SimulateIECBegin(void)
{
SetHeaderVersion();
Reset();
IEC_Bus::Read();
IEC_Bus::ReadBrowseMode();
}
// Paraphrasing Jim Butterfield
@ -432,7 +432,7 @@ IEC_Commands::UpdateAction IEC_Commands::SimulateIECUpdate(void)
do
{
//DEBUG_LOG("Reset during SimulateIECUpdate\r\n");
IEC_Bus::Read();
IEC_Bus::ReadBrowseMode();
IEC_Bus::WaitMicroSeconds(100);
}
while (IEC_Bus::IsReset());
@ -444,7 +444,7 @@ IEC_Commands::UpdateAction IEC_Commands::SimulateIECUpdate(void)
switch (atnSequence)
{
case ATN_SEQUENCE_IDLE:
IEC_Bus::Read();
IEC_Bus::ReadBrowseMode();
if (IEC_Bus::IsAtnAsserted()) atnSequence = ATN_SEQUENCE_ATN;
else if (selectedImageName[0] != 0) updateAction = IMAGE_SELECTED;
break;
@ -462,7 +462,7 @@ IEC_Commands::UpdateAction IEC_Commands::SimulateIECUpdate(void)
// TODO: should set a timer here and if it times out (before the clock is released) go back to IDLE?
while (IEC_Bus::IsClockReleased())
{
IEC_Bus::Read();
IEC_Bus::ReadBrowseMode();
}
break;
case ATN_SEQUENCE_RECEIVE_COMMAND_CODE:

11
src/main.cpp
View file

@ -745,7 +745,7 @@ void emulator()
while (1)
{
IEC_Bus::Read();
IEC_Bus::ReadEmulationMode();
if (pi1541.m6502.SYNC()) // About to start a new instruction.
{
@ -833,12 +833,7 @@ void emulator()
bool nextDisk = inputMappings->NextDisk();
bool prevDisk = inputMappings->PrevDisk();
if (exitEmulation)
{
emulating = false;
break;
}
else if (nextDisk)
if (nextDisk)
{
pi1541.drive.Insert(diskCaddy.PrevDisk());
}
@ -864,7 +859,7 @@ void emulator()
}
bool reset = IEC_Bus::IsReset();
if (reset)
if (reset || exitEmulation)
{
// Clearing the caddy now
// - will write back all changed/dirty/written to disk images now